3Com MSR 50 Series, Руководство по настройке

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Troubleshooting IPv6 PIM Configuration 1275
routing-table command to view the PIM routing table information on each
router. For example:
# View the IPv6 PIM multicast routing table information on Router A.
[RouterA] display pim ipv6 routing-table
Total 0 (*, G) entry; 1 (S, G) entry
(4001::100, FF3E::101)
Protocol: pim-ssm, Flag:
UpTime: 00:00:11
Upstream interface: Serial2/0
Upstream neighbor: 1002::2
RPF prime neighbor: 1002::2
Downstream interface(s) information:
Total number of downstreams: 1
1: Ethernet1/0
Protocol: mld, UpTime: 00:00:11, Expires: 00:03:25
The information on Router B and Router C is similar to that on Router A.
# View the IPv6 PIM multicast routing table information on Router D.
[RouterD] display pim ipv6 routing-table
Total 0 (*, G) entry; 1 (S, G) entry
(4001::100, FF3E::101)
Protocol: pim-ssm, Flag: LOC
UpTime: 00:08:02
Upstream interface: Ethernet1/0
Upstream neighbor: NULL
RPF prime neighbor: NULL
Downstream interface(s) information:
Total number of downstreams: 1
1: Serial2/0
Protocol: pim-ssm, UpTime: 00:08:02, Expires: 00:03:25
Troubleshooting IPv6
PIM Configuration
Failure of Building a
Multicast Distribution
Tree Correctly
Symptom
None of the routers in the network (including routers directly connected with IPv6
multicast sources and receivers) has IPv6 multicast forwarding entries. That is, a
multicast distribution tree cannot be built correctly and clients cannot receive IPv6
multicast data.
Analysis
■
An IPv6 PIM routing entry is created based on an IPv6 unicast route, whichever
IPv6 PIM mode is running. Multicast works only when unicast does.
■
The RPF interface must support IPv6 PIM. An RPF neighbor must be an IPv6 PIM
neighbor as well. If IPv6 PIM is not enabled on the RPF interface or the RPF
neighbor, the establishment of a multicast distribution tree will surely fail,
resulting in abnormal multicast forwarding.